Heart rate variability during different training periods in 17 elite swimmers - Lacoste, L.; Caudal, N.; Vanoorenberg, P.; Schmitt, L.; Fauquet, C.; Cervetti, J. P.; Rey, J. L.; Hellard, P. (Book of Abstracts - 9th Annual Congress European College of Sport Science, July 3-6, 2004, Clermont-Ferrand, France, 2004)